904 wont up shift

Well it wasn't anything to do with the valve bodie nor the kick down linkage, I am absolutly certain that both are right on, also removed restrictor plug from the front clutch feed hole, still no high gear till 50. Buddy of mine has talked to some transmission "guru's" and supposedly they believe that it's the gov. They say we should take out the gov thats in there and put the one in that came with the tranny that we got the low gear sets from. Something else I failed to mention was that as you decelerate it will shift down from high to second at around 35 or so and again from second to low at roughly 20, and it's a very firm jerk when it does. Any further opinions.

Not sure about what I am getting for stall as I don't have a tach in this car.